Answer
$12.0\ ft$
Work Step by Step
We solve for $w$ and then plug in the given values to obtain:
$$
V=lwh\Longrightarrow w=\frac{V}{lh}=\frac{3780}{21\times15}= 12.0\ ft
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 6 - Section 6.8 - Substituting Data into Formulas - Exercises - Page 259: 24
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